From: Qinglang Miao miaoqinglang@huawei.com
commit 67e40054de86aae520ddc2a072d7f6951812a14f upstream.
A list_add corruption is reported by Hulk Robot like this: ============== list_add corruption. Call Trace: link_obj+0xc0/0x1c0 link_group+0x21/0x140 configfs_register_subsystem+0xdb/0x380 acpi_configfs_init+0x25/0x1000 [acpi_configfs] do_one_initcall+0x149/0x820 do_init_module+0x1ef/0x720 load_module+0x35c8/0x4380 __do_sys_finit_module+0x10d/0x1a0 do_syscall_64+0x34/0x80
It's because of the missing check after configfs_register_default_group, where configfs_unregister_subsystem should be called once failure.
Fixes: 612bd01fc6e0 ("ACPI: add support for loading SSDTs via configfs") Reported-by: Hulk Robot hulkci@huawei.com Suggested-by: Hanjun Guo guohanjun@huawei.com Signed-off-by: Qinglang Miao miaoqinglang@huawei.com Cc: 4.10+ stable@vger.kernel.org # 4.10+ Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/acpi/acpi_configfs.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/acpi_configfs.c b/drivers/acpi/acpi_configfs.c index b588503890941..c0325556a897b 100644 --- a/drivers/acpi/acpi_configfs.c +++ b/drivers/acpi/acpi_configfs.c @@ -269,7 +269,12 @@ static int __init acpi_configfs_init(void)
acpi_table_group = configfs_register_default_group(root, "table", &acpi_tables_type); - return PTR_ERR_OR_ZERO(acpi_table_group); + if (IS_ERR(acpi_table_group)) { + configfs_unregister_subsystem(&acpi_configfs); + return PTR_ERR(acpi_table_group); + } + + return 0; } module_init(acpi_configfs_init);